Hello from Germany soon to Brazil!

Hello and welcome . Not sure if you intend to eventually get a bigger tank but 20 - 40 gallons is pretty small for a blue tang
sorry I worded that wrong. That’s the end goal once I complete the 20-40G and have a good grasp and can upgrade.
 
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Welcome to the community! I just started my saltwater journey as well with a 20G and I'd tell ya to go big and just get the 40G. It'll be a lot easier down the road with a bigger tank, cause I bet you'll want to expand and add different corals/fish and a 20G will hold you up :)
 

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